Sit down and take a deep breath. Then take a good look at your "naughty" Necchi. If you can remove the needle then remove the bobbin case (hope she came with one) and clean out any old lint and threads that might have jammed the machine. If she were mine I remove the top cover and oil everything that looks as if it would move. Open the face cover and do the same. Not sure about the underneath though. If you have another sewing machine with a cord block and foot controller you should be able to use it to see if your machine is functional motorwise. Look on the bright side, the cabinet might be usable for another sewing machine if the Necchi turns out to be a door stop.